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218
7647F–AVR–04/09
ATmega16/32/64/M1/C1
17.5.8
xxOK Flags
There are three xxOK flags in LINSIR register:
LIDOK: LIN IDentifier OK
It is set at the end of the header, either by the Tx Header function or by the Rx Header. In LIN
1.3, before generating LIDOK, the controller updates the LRXDL & LTXDL fields in LINDLR
register.
It is not driven in UART mode.
LRXOK: LIN RX response complete
It is set at the end of the response by the Rx Response function in LIN mode and once a
character is received in UART mode.
LTXOK: LIN TX response complete
It is set at the end of the response by the Tx Response function in LIN mode and once a
character has been sent in UART mode.
These flags can generate interrupts if the corresponding enable interrupt bit is set in the LINE-
17.5.9
xxERR Flags
LERR bit of the LINSIR register is an logical ‘OR’ of all the bits of LINERR register (see
Section LBERR = LIN Bit ERRor.
A unit that is sending a bit on the bus also monitors the bus. A LIN bit error will be flagged
when the bit value that is monitored is different from the bit value that is sent. After detection
of a LIN bit error the transmission is aborted.
LCERR = LIN Checksum ERRor.
A LIN checksum error will be flagged if the inverted modulo-256 sum of all received data
bytes (and the protected identifier in LIN 2.1) added to the checksum does not result in 0xFF.
LPERR = LIN Parity ERRor (identifier).
A LIN parity error in the IDENTIFIER field will be flagged if the value of the parity bits does
parity bits and a corrupted identifier. The hardware does not undertake any correction.
However, the LIN slave application has to solve this as:
- known identifier (parity bits corrupted),
- or corrupted identifier to be ignored,
- or new identifier.
LSERR = LIN Synchronization ERRor.
A LIN synchronization error will be flagged if a slave detects the edges of the SYNCH field
outside the given tolerance.
LFERR = LIN Framing ERRor.
A framing error will be flagged if dominant STOP bit is sampled.
Same function in UART mode.
LTOERR = LIN Time Out ERRor.
A time-out error will be flagged if the MESSAGE frame is not fully completed within the
maximum length T
Frame_Maximum by any slave task upon transmission of the SYNCH and